Specifications

A-18
Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Appendix A Downloading and Installing Software Upgrades
Quickstart Procedures for Software Downgrades
PXM45 and AXSM Boot Downgrades
When redundant cards are used and the downgrade software is compatible with the existing runtime
software, boot software downgrades can be graceful. To perform a graceful downgrade of boot software,
follow the instructions for the appropriate graceful software upgrade:
• Graceful PXM45 Boot Upgrades
• Graceful AXSM or FRSM-12 Boot Upgrades
Caution Cisco Systems, Inc., does not guarantee that any software downgrade is graceful, so assume that the
downgrade is non-graceful and time the downgrade accordingly. The advantage to following the graceful
upgrade procedures listed above is that you might be able to delay traffic interruption until the runtime
software is downgraded.
When upgrading a standalone card, the downgrade is non-graceful, and you should follow one of the
following software upgrade procedures:
• Non-Graceful PXM45 Boot Upgrades
• Non-Graceful AXSM Boot Upgrades
Non-Graceful PXM45 Runtime Software Downgrades
To downgrade PXM45 runtime software, you must clear the entire switch configuration.All traffic is
disrupted until the switch downgrade is complete and the configuration has been re-entered. The
following quickstart procedure is provided as an overview for PXM45 runtime software downgrades.
Note The switch does not support a configuration restore to a downgraded software version. When you
downgrade the PXM45 runtime software, you must re-enter the configuration.
Command Purpose
Step 1
username
password
Establish a CLI session with the active PXM45 card using a user
name with SERVICE_GP privileges.
Step 2
saveallcnf
y
Save the current switch configuration.
See “Saving a Configuration” in Chapter 7, “Switch Operating
Procedures.”
This step gives you the option to upgrade to the software version
from which you are downgrading and use the former
configuration.
Step 3
ftp Copy the boot and runtime files you want to use to the switch.
Also copy the saved configuration file from the C:CNF directory
to a remote workstation so you have a backup file if something
happens to the hard disk.
See “Copying Software Files to the Switch,” which appears later
in this appendix.